Spitfire features that serious bowhunters have preferred for over 10 years. Field point accuracy, offset blades and no o-rings or rubber bands, rock solid reliability and renown NAP quality. 0.02 inch Thick Blades, Cut-On-Contact Point, Micro-Grooved Ferrule. Super large 1-3/4" cutting diameter for devastating take down power. The largest entrance and exit holes for massive blood trails. Diamize™ sharpening process create the sharpest blades in the industry for massive hemorrhaging.